- Southern Terminus:
- Broad Street (CT 159) in Windsor
- Northern Terminus:
- Connecticut-Massachusetts state line
- 13.52 miles
CT 75 is a north/south route in northern central Connecticut. It begins as a two-lane road called Poquonock Avenue at Broad Street (CT 159) in Windsor and runs to the northwest. There is an interchange with the Bradley Airport Connector (CT 20), at which it widens to four lanes and becomes Ella T. Grasso Turnpike. Ella T. Grasso Turnpike runs north through Windsor Locks along the eastern boundary of Bradley International Airport. In Suffield, CT 75 narrows down to two lanes again. It continues north to the Massachusetts state line.